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Equity Incentive Plans - Summary of Restricted Stock Unit Activity (Details) - $ / shares
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Weighted-Average Grant Date Fair Value per Share      
Weighted-Average Grant Date Fair Value per Share, Nonvested Outstanding, Granted $ 5.61 $ 7.36 $ 24.22
Restricted Stock Units (RSUs) | 2019 Equity Incentive Plan      
Restricted Stock Units Outstanding      
Restricted Stock Units Outstanding, Nonvested Outstanding, Beginning Balance 5,981,755    
Restricted Stock Units Outstanding, Granted 6,949,587    
Restricted Stock Units Outstanding, Forfeited (1,755,018)    
Restricted Stock Units Outstanding, Vested (1,506,864)    
Restricted Stock Units Outstanding, Nonvested Outstanding, Ending Balance 9,669,460 5,981,755  
Weighted-Average Grant Date Fair Value per Share      
Weighted-Average Grant Date Fair Value per Share, Nonvested Outstanding, Beginning Balance $ 14.11    
Weighted-Average Grant Date Fair Value per Share, Nonvested Outstanding, Granted 8.29 $ 11.43 $ 37.98
Weighted-Average Grant Date Fair Value per Share, Nonvested Outstanding, Forfeited 11.24    
Weighted-Average Grant Date Fair Value per Share, Nonvested Outstanding, Vested 14.95    
Weighted-Average Grant Date Fair Value per Share, Nonvested Outstanding, Ending Balance $ 10.32 $ 14.11